Yarn brake



H. SCHLICK May 14, 1946.

YARN BRAKE vFiled oct. 1. 1957 2 sheets-sheet 1 H. SCHLICK `YARN BRAKEMay m w40.

2 sheets-shee't 2 Filed Oct. 1, 19157 INVENTOR.

HELL MUT 6CH/ MK i.; ATTORNEY 'Patented May 14, 1940 UNITED STATESPATENT OFFICE 8 Claims.

My invention relates to a yarn brake for textile machines, and moreparticularly to a yarn brake having a stationary member and a pivotalmem-'- ber associated therewith, in which each of said members isprovided with a plurality of spaced gripping elements and the grippingelements of the two members interengage each other to form a brakingpassage for the yarn. Yarn brakes of above described type are especiallyadapted for lo use in creeis; the yarns of the bobbins carried by thecreel pass through the braking passage of the yarn brakes when they arewarped on the beam of a warping or beaming machine.

One object of my invention is to provide a yarn brake of above describedtype, which is very sensitive and permits extremely high travellingspeeds of the yarn without causing a breakage ci the yarn.

n further object of my invention is to provide go a yarn brake of abovedescribed type, which is very sensitive and does not tend to vibrate.

Another object of my invention is to `provide a yarn brake of abovedescribed type, which has a high eiiciency and maintains a uniform ten-25 sion of the yarn at various speeds.

in order to carry out my invention into practice l provide a yarn brakecomprising a stationary member, a pivoted member associated with saidstationary member, each of said members carry- 30 ing a plurality ofspaced gripping elements, the gripping elements of the stationary memberand the gripping elements of the pivoted member interengaging each otherand forming a braking passage for the yarn, the center of gravity of the35 pivoted member being so related to its pivot that it tondo to causetno gripping elements of the pivoted member to swing toward the grippingelements of the stationary member tocause a pressure on the yarn, and adampening dash-pot fio arrangement connected' to said pivoted member fordampening the vibrations of said pivoted member caused by the passingyarn.

The above mentioned objects and advantages as well as other objects andadvantages will be i5 moro muy disclosed in the fouowing specificationreference being had to the accompanying drawings forming a part of thisspecification, in .yhlch:v i v Fig. 1 is a perspective view of the yarnbrake, Fig. 2 is a fragmentary view of the gripping elements of themembers of the yarn brake,

Fig. 3 is a perspective view of the yarn brake,

partly Vin section; some parts of the yarn brake 55 being omitted orbeing broken away for a better illustration of the dampening dash-potarrangement, Y

Fig. 4 is a fragmentary view of the yarn brake illustrating thefunnel-shaped inlet as seen in the direction oi arrow A of Fig. l,

Fig. 5 is a cross-sectional view of the yarn brake taken on line 5-5 ofFig. 4,

Fig. 6 is a fragmentary end view of a yarn` brake provided with adifferent embodiment lof a dash-pot arrangement,

Fig. 'i is a perspective vview of the yarn brake similar to that shownin Fig. 3, in which, huwever. the yarn brake is equipped with anadditional adjustable load in form of a spring,

, Fig. is a fragmentary view of a yarn brake similar to that shown inFig. 6, in which, however, the yarn brake is equipped with an adjustable load in form of a weight, and

Fig. 9 is a diagrammatic side end view of a creei with a plurality ofyarn brakes and a single controlling member for the simultaneousadjustment of the adjustable loads arranged on said yarn brakes.

Referring to the drawings, i represents one of the rods, which areprovidedin the creci for the attachment of the yarn brakes or stretchingdevices. Each yarn brake is mounted on a holder or support 2, which mayconsist for instance of metal. The brake proper comprises a stationarypart 3 provided with a plurality of spaced gripping elements or fingers3', the shape of which will be seen from Figure 2, and a movable part tprovided with a plurality of gripping elements or lingers t'. Both partsmay consist of porcelain. The gripping elements t' of the stationarymember 3 and the gripping elements 6 of the pivotal member 6 interengageeach other and form a braking passage for the yarn 1. The swingable partis mounted between arms 5 and of the holder 2. The yarn 1 passes throughthe substantially horizontal braking passage between the stationarylingers 3' and the swngable part 6 carrying fingers 6', that is to sayit is unwound from the bobbin (not shown) and enters the inlet openingof a funnel 8 which is formed integrally with the part 3. The center ofgravity of the'pivotal member 6 is so related to its pivot that itcauses an automatic pressure on the yarn 1. The funnel has a length ofabout 5 centimeters so that the balloon of the yarn cannot get entangledwith the brake. The axis of the funnel-shaped inlet extends inlhorizontal` 9 by which it is turned by 90. In order to insert the threadbetween the -fingers 3 and 6', the

' fingers are opened as shown in Figure 2 in dotted lines. The outleteyelet I is formed open so that the yarn has to be threaded only intothe opening 8 when it is inserted into the brake.

The dash-pot arrangement for damping the v oscillations of the movableor swingable part 3 ment is shown in Figure 6, according to which bladesI5 are mounted on the pivot Il of the member G. The blades I5 aremovable in a container I'I that is lled with a liquid, for instance oil,whereby a good damping of the oscillations of the member 6 is effected.

In the embodiments of the yarn brakes shown in Figs. 1-6, the pivotalmember 6 with its gripping elements bears against the yarn under its ownweight for causing the braking effect. In some cases, however, forexample if less sensitive yarn passes through the brake, it may bedesirable to produce an additional pressure on the yarn by means of aseparate load acting on the pivotal member 6. Such a separate load maybe a spring I8 stretched between the rod I2a of the dash-pot arrangementand an arm 23 as shown in Fig. 7, or it may be a weight I9 arrangedonthe extension IIa of the pivot II as shown in Fig. 8. When the arm 23(Fig. 7) is stationary or the weight I9 (Fig. 8) is immovably mounted onthe extension of the pivot Il, the additional load cannot be adjusted.

Where it is intended to cha'nge the tension ofr all braking devices of acreel at the same time, the arms 23 of the brakes according to Fig '7may be mounted on the common regulating rod 20. If the regulating rod isupwardly or downwardly moved, all of the springs I8 are stretched orrelaxed simultaneously. By connecting all of the regulating rods of thecreel together it is possible to regulate all yarn brakes from a commonregulating point. For example, Fig. 9 diagrammatically Aillustrates thearrangement of a plurality of yarn brakes 40 in a creel 4I carrying thebobbins 42. All of the brakes are mounted on the vertical rods I of thecreel and are equipped with above described additional loads in form ofa spring I8 as shown in Fig. '7. Each vertical column of yarn brakes hasa. single regulating rod 20 connected to all springs of the brakes ofthe respective column, and all the regulating rods 20 are operativelyconnected to a single controlling shaft 43 by means of cams 44 securedto the shait 43 and engaged with the hubs o f the arms 23. A rotation ofthe shaft 43 by means of the lever 45 in either direction causes asimultaneous lifting or lowering of all regulating rodsI 20 in thecreel, so that the tension of the springs I8 of all yarn brakes in thecreel is changed at the same time.

Brakes of the kind shown in Figure 8 may be commonly regulated in such away that the weights I9 are displaceably arranged on the bent portionIla of the shaft II. The guiding pin 24 of the weight I9 is slidablyengaged with a slot of the regulating member 22 secured to theregulating rod 2l. By movement of the regulating rod in either directionof the arrow b, the weight I9 may be shifted on the extention Ila forchanging the pressure caused by the iingers 6 on the yarn. If desired,the regulating rods 2i of all yarn brakes in a creel may be operativelyconnected to a single controlling member, so that the weight of allbrakes may be adjusted at the same time by a movement of saidcontrolling member. For this purpose, an arrangement similar to thatshown in Fig. 9 may be used.

I prefer to make all parts of my novel brake round or to cover them inorder to prevent the passing threads from being caughtby parts of thedevice.

A very important advantage of my novel brake resides in the fact thatthe speed of the warping machine can be considerably increased withoutbreakage of the yarn. Practice has shown that even in case of a drawingor unwinding speed of 1000 meters vper minute, a thread of artificialsilk had a tension of only 16 grams when my novel brake was inserted,while with the known yarn brakes the thread showed tensions up to 300grams already at drawing speeds of 400 meters per minute so that thethread breaks very frequently. My novel brake ensures reliable workingup to very high unwinding or drawing speeds.

While I have herein shown and described certain preferred embodiments ofmy invention, I wish it to be understood that I do not conne myself toall the precise details herein set forth by way of illustration, asmodification and variation may be made without departing from the spiritof the invention or exceeding the scope of the appended claims.

Having now described my invention what I claim is:

1. A yarn brake for textile machines, comprising a stationary member, apivoted member associated with said stationary member, each of saidmembers carrying a plurality of spaced gripping elements, the grippingelements of the stationary member and the gripping elements of thepivoted member interengaging each other and forming a braking passagefor the yarn, the center of gravity of the pivoted member being sorelatedto its pivot that it tends to cause the gripping elements of thepivoted member to swing toward the gripping elements of the stationarymember to cause a pressure on the yarn, and a dampening dash-potarrangement connected to said pivoted member for dampening thevibrations of said pivoted member caused by the passing yarn.

2. A yarn brake as claimed in claim 1, the` sociated with saidstationary member, each of said members carrying a plurality of spacedgripping elements, the gripping elements of the stationary member andthe gripping elements of the pivoted member interengaging each other andforming a braking passage for the yarn, the center of gravity of thepivoted member being so related to its pivot that it tends to cause thegripping elements of the pivoted member to swing toward the grippingelements of the stationary member to cause a. pressure on the yarn, afunnelshaped inlet associated with said stationary member, the axis ofsaid funnel-shaped inlet being substantially at aright angle to the axisof said braking passage, and a dampening dast-pot arrangement connectedto said pivoted member for dampening the vibrations of said pivotedmember caused by the passing yarn.

4. A yarn brake as claimed in claim 3, in which the axes of saidfunnel-shaped inlet and of said braking passage extend in horizontaldirection.'

5. A yarn brake as claimed in 'claim 1, a s'eparate load being connectedto said pivoted member for pressing its gripping elements against theyarn.

6. A yarn brake as claimed in claim 1, an adjustable load beingassociated with said pivoted Vmember for pressingk its gripping elementsagainst the yarn. i

7. A yarn brake arrangement for textile machines comprising a. pluralityof individual yarn brakes as claimed in claim 1, adjustable loads beingassociated with the pivoted member of each individual yam brake, andcontrolling means, said controlling means being operatively `connectedto all adjustabler loads of the individual yarn brakes for asimultaneous adjustment thereof.

8. A yarn brake for textile machines, comprising a stationary membercarrying a series of spaced gripping elements, a pvoted memberassociated with said stationary member, said pivoted member including ashaft, a sw'lngable arm and a series of spaced gripping elements, thegripping elements of the stationary member and the gripping elements ofthe pivoted member alternately'interengaging each other and forming asubstantially horizontal braking passage for the yarn, the shaft of thepivoted member being substantially parallel to said braking passage forthe yarn, a separate load being connected to said pivoted member forcausing the gripping elements of the pivoted member to swing toward thegripping elements oi the stationary member to cause a pressure on theyarn,

and a dampening dash-pot arrangement connected to the said arm of thesaid pivoted member for dampening the vibrations of said pivoted 20member caused by the passing yarn.

HELLMUT SCHLICK.

